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Solution Processed Bilayer Metal Halide White Light Emitting Diodes.

He Liu1, Tunde Blessed Shonde1, Oluwadara Joshua Olasupo1

  • 1Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL, 32306, USA.

Advanced Materials (Deerfield Beach, Fla.)
|November 7, 2024
PubMed
Summary

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Materials horizons·2024

Highly efficient white LEDs were created by combining sky-blue emitting metal halide perovskites with orange/red emitting organic metal halide hybrids. This novel approach achieves stable white electroluminescence for advanced lighting applications.

Area of Science:

  • Materials Science
  • Optoelectronics
  • Solid-State Chemistry

Background:

  • Metal halide perovskites and organic metal halide hybrids (OMHHs) are promising luminescent materials for LEDs.
  • They offer high efficiency, tunable colors, and solution processability.
  • Monochromatic LEDs are advanced, but efficient white LEDs remain a challenge.

Purpose of the Study:

  • To develop a facile approach for generating highly efficient and stable white electroluminescence (WLEDs).
  • To combine the unique properties of metal halide perovskites and OMHHs for WLED applications.

Main Methods:

  • Fabrication of a solution-processed bilayer structure for WLEDs.
  • Utilizing 2D CsPbBr3 nanoplatelets as a sky-blue emitter.
  • Employing 0D TPPcarzSbBr4 as an orange/red emitter.
Keywords:
0‐D organic metal halide hybridbilayer structurelight emitting diodesmetal halide perovskiteswhite emission

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Main Results:

  • The fabricated WLEDs demonstrated a peak external quantum efficiency (EQE) of 4.8%.
  • A luminance of 1507 cd m⁻² was achieved at CIE coordinates (0.32, 0.35).
  • The combination of perovskite and OMHH emitters enabled white light generation.

Conclusions:

  • A new pathway for creating efficient and stable WLEDs using perovskites and OMHHs has been established.
  • This work addresses the challenge of achieving white electroluminescence from a single LED.
  • The developed materials and device architecture show significant potential for lighting technologies.